Download Electronic warfare and radar systems engineering handbook by Scott O’Neill PDF

By Scott O’Neill

Comprises complete colour and black and white illustrations, This instruction manual is designed to assist digital war and radar structures engineers in making common estimations relating to services of structures. This instruction manual is backed via the NAVAIR Director of digital war / strive against structures. Chapters comprise: basics; Antennas; Radar Equations; Radar and Receiver features and attempt; Microwave / RF elements; Electro-optics an IR; plane Dynamics concerns; Date move Busses; word list; Abbreviations and Acronyms. comprises CD with extra reference and path fabrics fabrics

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BEAM FACTOR Antenna size and beamwidth are also related by the beam factor defined by: Beam Factor = (D/8)@(Beamwidth) where D = antenna dimension in wavelengths. The beam factor is approximately invariant with antenna size, but does vary with type of antenna aperture illumination or taper. The beam factor typically varies from 50-70E. APERTURE ILLUMINATION (TAPER) The aperture illumination or illumination taper is the variation in amplitude across the aperture. This variation can have several effects on the antenna performance: (1) reduction in gain, (2) reduced (lower) sidelobes in most cases, and (3) increased antenna beamwidth and beam factor.

Generally, we are interested in the half-power (3 dB) beamwidth. It turns out that this beamwidth is approximately one-half of the null-to-null beamwidth, so that: BW3 dB . (½)(22) = 8/L [8] Therefore, beamwidth is a function of the antenna dimension “L” and the wavelength of the signal. It can be expressed as follows: Note: for circular antennas, L in the following equations = diameter BwN(az) = 8/LAz eff and BW2(el) = 8/LEl eff [9] Substituting the two variations of equation [9] into equation [3] and since LAz eff times LEl eff = Ae (effective capture area of the antenna), we have: G • 4B Laz Lel 4B Ae 4B ' ' 2 BWN BW2 (radians) 8 82 [10] Note: Equation is approximate since aperture efficiency isn’t included as is done later in equation [12].

RF Measurements - If the receiver bandwidth is smaller than the PRF, the receiver will respond to one spectral line at a time. If the receiver bandwidth is wider than the PRF but narrower than the reciprocal of the PW, the receiver will respond to one spectral envelope at a time. Jet Engine Modulation (JEM) Section 2-6 addresses the Doppler shift in a transmitted radar signal caused by a moving target. The amount of Doppler shift is a function of radar carrier frequency and the speed of the radar and target.

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